Removing ZERO_PAGE abd_alloc_zero_scatter #10428
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bwatkinson
referenced
this pull request
Jun 9, 2020
Adding the gang ABD type, which allows for linear and scatter ABDs to be chained together into a single ABD. This can be used to avoid doing memory copies to/from ABDs. An example of this can be found in vdev_queue.c in the vdev_queue_aggregate() function. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Co-authored-by: Brian <bwa@clemson.edu> Co-authored-by: Mark Maybee <mmaybee@cray.com> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #10069
behlendorf
reviewed
Jun 9, 2020
For MIPS architectures on Linux the ZERO_PAGE macro references empty_zero_page, which is exported as a GPL symbol. The call to ZERO_PAGE in abd_alloc_zero_scatter has been removed and a single zero'd page is now allocated for each of the pages in abd_zero_scatter in the kernel ABD code path. Signed-off-by: Brian Atkinson <batkinson@lanl.gov>
behlendorf
approved these changes
Jun 9, 2020
Codecov Report
@@ Coverage Diff @@
## master #10428 +/- ##
==========================================
- Coverage 79.46% 79.46% -0.01%
==========================================
Files 391 391
Lines 123632 123638 +6
==========================================
+ Hits 98245 98246 +1
- Misses 25387 25392 +5
Continue to review full report at Codecov.
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behlendorf
added
Status: Accepted
lundman
referenced
this pull request
in openzfsonosx/openzfs
Jun 12, 2020
For MIPS architectures on Linux the ZERO_PAGE macro references empty_zero_page, which is exported as a GPL symbol. The call to ZERO_PAGE in abd_alloc_zero_scatter has been removed and a single zero'd page is now allocated for each of the pages in abd_zero_scatter in the kernel ABD code path. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #10428
jsai20
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to jsai20/zfs
that referenced
this pull request
Mar 30, 2021
For MIPS architectures on Linux the ZERO_PAGE macro references empty_zero_page, which is exported as a GPL symbol. The call to ZERO_PAGE in abd_alloc_zero_scatter has been removed and a single zero'd page is now allocated for each of the pages in abd_zero_scatter in the kernel ABD code path. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes openzfs#10428
sempervictus
pushed a commit
to sempervictus/zfs
that referenced
this pull request
May 31, 2021
For MIPS architectures on Linux the ZERO_PAGE macro references empty_zero_page, which is exported as a GPL symbol. The call to ZERO_PAGE in abd_alloc_zero_scatter has been removed and a single zero'd page is now allocated for each of the pages in abd_zero_scatter in the kernel ABD code path. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes openzfs#10428
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For MIPS architectures on Linux the ZERO_PAGE macro references
empty_zero_page, which is exported as a GPL symbol. The call to
ZERO_PAGE in abd_alloc_zero_scatter has been removed and a single
zero'd page is now allocated for each of the pages in abd_zero_scatter
in the kernel ABD code path.
Signed-off-by: Brian Atkinson batkinson@lanl.gov
For MIPS architectures in Linux the ZERO_PAGE macro references empty_zero_page. This is a GPL only symbol.
Motivation and Context
Removes a dependency on a GPL symbol for MIPS architectures.
Description
In order to fix this, I have removed the call to ZERO_PAGE in the Linux abd_os.c for allocating the abd_zero_scatter ABD. Instead I just allocate a single page and pass the __GP_ZERO flag to zero out the page.
How Has This Been Tested?
I tested with zloop.sh (ran for 30 mins) and ZTS test.
Test on CentOS Linux kernel 4.18.5.
Types of changes
Checklist:
Signed-off-by.